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Here's why Republicans are 'red' and Democrats are 'blue' - USA TODAY
Why is red for Republicans and blue for Democrats?
When Republicans Were Blue and Democrats Were Red
Why is the Democratic Party associated with the colour blue?
Why Democrats Are Blue and Republicans Are Red - Slate Magazine
Why Democrats Are Blue and Republicans Are Red?
Beyond Red vs. Blue: The Political Typology - Pew Research Center
Blue shift (politics) - Wikipedia
Red vs. Blue: A history of how we use political colors
Political Background Blue royalty-free images - Shutterstock